Police in San Bruno have identified the parents of a deceased infant whose body was discovered in a city park more than four decades ago, marking a major breakthrough in a cold case through the use of forensic genetic genealogy.

The infant’s remains were found in Buckeye Park in November 1981, but investigators at the time were unable to determine the child’s identity or who was responsible for the death. The case remained unsolved for more than 40 years despite repeated reviews.

In a statement Tuesday, the San Bruno Police Department said that by using modern DNA analysis and forensic genealogy, its officers, along with the Texas Department of Public Safety and other forensic partners, have identified the infant’s family.

Forensic genetic genealogy is a modern investigative technique that combines DNA analysis with genealogical research to identify unknown victims or suspects. Investigators compare DNA from crime scenes or unidentified remains with profiles shared on public genealogy databases, tracing possible relatives to build family trees and narrow down identities.

While detectives have confirmed the identities of both parents, police said their names will not be released for now as the investigation continues.

“This identification represents a major step forward in the case and has renewed efforts to bring this case to justice,” the department said.

Detectives are appealing to the public for information about the events in Buckeye Park in November 1981 or anyone who may have knowledge about the infant or the family.

Anyone with information is asked to contact the San Bruno Police Department at (650) 616-7100 or email sbpdtipline@sanbruno.ca.gov. Tips can be left anonymously.